a leap in the dark a daring step or enterprise whose consequences are unpredictable.
by leaps and bounds with startlingly rapid progress.
leap to the eye be immediately apparent.
look before you leap: seelook.
英语词组固定搭配大全包含15956条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。